Copied from MB Trading...

Metatrader is the most popular front-end application in the industry, and MB Trading has attached our ECN execution to the platform. We’ve taken the user-friendly front-end trading interface and added the execution that the market has been looking for. We’ve turned off the deal-desk functionality of the platform and made the executions as true as our systems can handle. What does Metatrader 4.0 through MB Trading offer?

* Direct ECN connections and execution
* Tight ECN spreads and quotes
* A true non-deal desk environment
* NO proximity restrictions when placing entry or exit orders
* Scalping available

While other brokers have offered Metatrader for years, MB Trading wouldn’t offer the system until we we could eliminate the deal desk functionality of the back-office systems of Metatrader. With this solution, our customers can experience Metatrader as it was supposed to be, without desk interventions, fixed-slippages, and stop and limit proximity limitations. We open the door to any available execution using Metatrader, and we give no priority to opening, closing, or hedging positions.

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I find it interesting that MBT is posting info about the "deal desk" functionality of MT4. Many brokers would have you believe that there is no dealing desk, and that there is no such thing as 'desk interventions, fixed-slippages, and stop and limit proximity limitations'. There was a thread on metatrader's own forums a while back that mentioned these things, but it was quickly removed after trader's started asking about how and why MT4 had these capabilities. If you trade with any MT4 broker, you should be asking how they use the dealing desk functions of MT4 and how it affects your trading.